US3842562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocking precast concrete slabs
Assignee: LARSEN V CO
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Filing: 1972-10-24
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Granted: 1974-10-22
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Expires: 1992-10-24
Abstract
Abstract Precast concrete slabs are joined together to form a walk or patio-like matrix by embedding a plurality of rods in each slab and providing cavities in the bottom faces of each slab. Each rod has a hooked end portion which projects beyond opposing end walls of the slab, the hooked end portions and the cavities being positioned such that the hooked end portions of one slab are receivable in the cavities of another slab, whereby the slabs may be interlocked end to end to form a strip of slabs. Similar cavities and rods having hooked ends may be positioned in each slab at right angles to the aforementioned rods and cavities to permit sidewise connection of the slabs along with the end-to-end connection.
Inventors
- 👤 J Daigle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:41
CPC Classifications
E; E01; E01C; E01C5/00; E01C5/06; E01C5/08; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/06; E04F; E04F15/00; E04F15/02; E04F15/08; E01C2201/00; E01C2201/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
176 words
In a precast concrete slab for connection with other said slabs to form a generally horizontal, stable, load bearing surface, the improvement which comprises a plurality of rods firmly embedded in said slab and a plurality of cavities in the lower face of said slab and spaced from the adjacent edges thereof, said rods providing a plurality of first hooked end portions projecting beyond a first end wall of said slab adjacent the plane of said lower face and a plurality of second hooked end portions projecting beyond an opposing end wall of said slab also adjacent the plane of said lower face, said end walls corresponding to said adjacent edges, said hooked end portions being adapted to lie beneath a peripheral edge portion and to be received in said cavities of an adjacent slab having similar hooked end portions and cavities, said cavities and said hooked end portions of each slab corresponding in number, whereby a plurality of said slabs are interlockable end to end by a scissor action to form a strip of slabs.
Claim 2
Dependent Claim
176 words
In a precast concrete slab for connection with other said slabs to form a generally horizontal, stable, load bearing surface, the improvement which comprises a plurality of rods firmly embedded in said slab and a plurality of cavities in the lower face of said slab and spaced from the adjacent edges thereof, said rods providing a plurality of first hooked end portions projecting beyond a first end wall of said slab adjacent the plane of said lower face and a plurality of second hooked end portions projecting beyond an opposing end wall of said slab also adjacent the plane of said lower face, said end walls corresponding to said adjacent edges, said hooked end portions being adapted to lie beneath a peripheral edge portion and to be received in said cavities of an adjacent slab having similar hooked end portions and cavities, said cavities and said hooked end portions of each slab corresponding in number, whereby a plurality of said slabs are interlockable end to end by a scissor action to form a strip of slabs.
Claim 3
Dependent Claim
50 words
A concrete slab as in claim 1 wherein said plurality of rods comprises first and second pairs of rods, the hooked end portions of said first pair projecting beyond an end wall of said slab opposite the end wall beyond which project the hooked end portions of said second pair.
Claim 4
Dependent Claim
33 words
A concrete slab as in claim 2 wherein the hooked end portions of said first pair of rods are spaced farther apart than the hooked end portions of said second pair of rods.
Claim 5
Dependent Claim
36 words
A concrete slab as in claim 2 wherein the hooked end portions of said first pair of rods are spaced apart substantially the same distance as the hooked end portions of said second pair of rods.
Claim 6
Dependent Claim
43 words
A concrete slab as in claim 1 wherein said plurality of rods comprises a pair of rods, each end of each rod defining a said hooked end portion and the end portions of each rod projecting beyond opposite end walls of said slab.
Claim 7
Dependent Claim
28 words
A concrete slab as in claim 5 wherein said rods are embedded generally parallel in said slab such that each rod passes between a pair of said cavities.
Claim 8
Dependent Claim
48 words
A concrete slab as in claim 6 wherein the hooked end portion of each rod is equidistant from the hooked end portion of the other rod which projects beyond the same end wall, whereby said slab is interlockable from either end with either end of another said slab.
Claim 9
Dependent Claim
79 words
A concrete slab as in claim 1 further including a slot corresponding to each cavity extending from each cavity to the adjacent end wall of said slab, and wherein said hooked end portions include projecting intermediate rod portions, said slots being positioned to receive said intermediate rod portions of others of said slabs whereby said intermediate rod portions, when said slabs are interlocked end to end, lie in a plane no lower than the lower faces of said slabs.
Claim 10
Dependent Claim
94 words
A concrete slab as in claim 1 further including an additional rod embedded in said slab, said slab having an additional cavity in the lower face thereof, said additional rod having a hooked end portion and an intermediate portion each projecting beyond a side wall at a generally right angle to said other hooked end portions, said cavity being positioned to receive said additional hooked end portion of an adjacent slab, whereby said slabs are interlockable side by side to form a matrix with others of said slabs which are interlocked end to end.
Claim 11
Dependent Claim
77 words
A concrete slab as in claim 9 further including a slot corresponding to each said additional cavity extending from each said additional cavity to an adjacent end wall of said slab, said slot being positioned to receive said projecting intermediate rod portion of another of said slabs whereby said intermediate rod portion, when said slabs are interlocked side by side to form said matrix, lies in a plane no lower than the lower faces of said slabs.
Claim 12
Dependent Claim
137 words
A precast slab for constructional use which comprises a slab body having substantially parallel first and second surfaces and end walls lying substantially normal to said surfaces, and at least one metal rod, said rod having an extended portion firmly embedded in said slab, an end portion bent to exit from the slab through said second surface, bent again to lie adjacent the plane of said second surface and to project beyond the adjacent end wall, the projecting end being further bent to lie substantially parallel to said end wall and having a length less than the thickness of the slab between the first and second surfaces, said second surface being provided with a recess spaced from said end wall and having a depth at least equal to the length of said last named rod bent end.
Claim 13
Dependent Claim
137 words
A precast slab for constructional use which comprises a slab body having substantially parallel first and second surfaces and end walls lying substantially normal to said surfaces, and at least one metal rod, said rod having an extended portion firmly embedded in said slab, an end portion bent to exit from the slab through said second surface, bent again to lie adjacent the plane of said second surface and to project beyond the adjacent end wall, the projecting end being further bent to lie substantially parallel to said end wall and having a length less than the thickness of the slab between the first and second surfaces, said second surface being provided with a recess spaced from said end wall and having a depth at least equal to the length of said last named rod bent end.
Claim 14
Dependent Claim
37 words
A precast slab according to claim 11 wherein the recess is spaced from the end wall by a distance equal to the length of the projecting rod from said end wall to said last named bent end.
Claim 15
Dependent Claim
30 words
A precast slab according to claim 11 which includes two rods as claimed lying substantially parallel and projecting beyond the same end of the slab and two recesses as claimed.
Claim 16
Dependent Claim
36 words
A precast slab according to claim 13 which includes another two rods as claimed lying substantially parallel and projecting beyond an opposite end wall and another two recesses spaced from said opposite end wall as claimed.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |